Hi,I have a ct dicom image series of inhomogeneous phantom and I want to remove patient table that exist in these images.please help me.

for this purpose I write the following code in matlab a = dicomread('E:\dicom\44.dcm'); b=double(a);

sample=b(50:100,250:300); background=mean(mean(sample));

for i=1:512; for j=1:512; if i>385; b(i,j)=background; end end end

image=dicomwrite(uint16(b),'44.dcm');

when I run this code in matlab my images have a severe artifact but patient table remove from the image. how to fix this problem? please help me thanks in advance to your answer and your help.